Turn off hot tub when not in use. An electric hot tub will cost roughly $4 to heat from 70 to 100°F and then about $1 per day to maintain that temperature. So if you're not going to use your hot tub for the next four days you will save energy by turning it off.

Lower hot tub temperature. Lowering the water temperature of your hot tub can significantly reduce your energy use. Use a hot tub cover. Cover your hot tub whenever it is not being used. This can save you up to $50 per year if you use electricity to heat your tub.